I have a 22 lb frenchie we are wanting to take in cabin with us we've paid the money she a little over weight for the flight but she has a Sherpa large carrier she fits in laying down but not standing up. She seemed to like it at home. She likes small spaces. We figured we'd give it a go if it fails we'll eat the money and drive there (from key west to Houston ) I'm hoping they don't pay that close attention. Best advice I received was to have a back up plan.